If you use our DHCP on your Pi-hole and it stops working after updating to a recent version and you see something like
$ pihole status
::: DNS service is NOT running
$ pihole restartdns
Job for dnsmasq.service failed.
See 'systemctl status dnsmasq.service' and 'journalctl -xn' for details.
please navigate to your Settings page and click on [Save] in the DHCP field without changing anything. This will kick your DHCP server back into action.